In this paper, recovery of zinc from real spent pickling solutions by liquid–liquid extraction withtributyl phosphate (TBP) was studied. In particular, the effects of some parameters were investigated,such as the volume ratio between the organic phase and real spent pickling liquor (O/A) (1:2, 1:1, 2:1,4:1), the stirring time (5–20–30 min) and the TBP concentration (10%–55%–100%), in order to determinethe conditions leading to higher zinc extraction efficiency, as well as selectivity in relationshipsto other metals such as iron. After zinc extraction, TBP was successfully regenerated. Among severaltested solutions, water allows zinc recovery higher than 90%, especially at 10% diluted TBP solution.In addition, a double stripping step with water led to a near complete regeneration of TBP. In thepresent work, a process flowsheet is also proposed, where TBP at 10% concentration is used for zincextraction from a spent pickling solution and then regenerated in a double-step stripping stage withwater.
|Numero di pagine||8|
|Rivista||Desalination and Water Treatment|
|Stato di pubblicazione||Published - 2019|
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